release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/media/radio/radio-tea5764.c

   1 /*
   2  * driver/media/radio/radio-tea5764.c
   3  *
   4  * Driver for TEA5764 radio chip for linux 2.6.
   5  * This driver is for TEA5764 chip from NXP, used in EZX phones from Motorola.
   6  * The I2C protocol is used for communicate with chip.
   7  *
   8  * Based in radio-tea5761.c Copyright (C) 2005 Nokia Corporation
   9  *
  10  *  Copyright (c) 2008 Fabio Belavenuto <belavenuto@gmail.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  *
  26  * History:
  27  * 2008-12-06   Fabio Belavenuto <belavenuto@gmail.com>
  28  *              initial code
  29  *
  30  * TODO:
  31  *  add platform_data support for IRQs platform dependencies
  32  *  add RDS support
  33  */
  34 #include <linux/kernel.h>
  35 #include <linux/slab.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>                 /* Initdata                     */
  38 #include <linux/videodev2.h>            /* kernel radio structs         */
  39 #include <linux/i2c.h>                  /* I2C                          */
  40 #include <media/v4l2-common.h>
  41 #include <media/v4l2-ioctl.h>
  42 #include <linux/version.h>              /* for KERNEL_VERSION MACRO     */
  43
  44 #define DRIVER_VERSION  "v0.01"
  45 #define RADIO_VERSION   KERNEL_VERSION(0, 0, 1)
  46
  47 #define DRIVER_AUTHOR   "Fabio Belavenuto <belavenuto@gmail.com>"
  48 #define DRIVER_DESC     "A driver for the TEA5764 radio chip for EZX Phones."
  49
  50 #define PINFO(format, ...)\
  51         printk(KERN_INFO KBUILD_MODNAME ": "\
  52                 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
  53 #define PWARN(format, ...)\
  54         printk(KERN_WARNING KBUILD_MODNAME ": "\
  55                 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
  56 # define PDEBUG(format, ...)\
  57         printk(KERN_DEBUG KBUILD_MODNAME ": "\
  58                 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
  59
  60 /* Frequency limits in MHz -- these are European values.  For Japanese
  61 devices, that would be 76000 and 91000.  */
  62 #define FREQ_MIN  87500
  63 #define FREQ_MAX 108000
  64 #define FREQ_MUL 16
  65
  66 /* TEA5764 registers */
  67 #define TEA5764_MANID           0x002b
  68 #define TEA5764_CHIPID          0x5764
  69
  70 #define TEA5764_INTREG_BLMSK    0x0001
  71 #define TEA5764_INTREG_FRRMSK   0x0002
  72 #define TEA5764_INTREG_LEVMSK   0x0008
  73 #define TEA5764_INTREG_IFMSK    0x0010
  74 #define TEA5764_INTREG_BLMFLAG  0x0100
  75 #define TEA5764_INTREG_FRRFLAG  0x0200
  76 #define TEA5764_INTREG_LEVFLAG  0x0800
  77 #define TEA5764_INTREG_IFFLAG   0x1000
  78
  79 #define TEA5764_FRQSET_SUD      0x8000
  80 #define TEA5764_FRQSET_SM       0x4000
  81
  82 #define TEA5764_TNCTRL_PUPD1    0x8000
  83 #define TEA5764_TNCTRL_PUPD0    0x4000
  84 #define TEA5764_TNCTRL_BLIM     0x2000
  85 #define TEA5764_TNCTRL_SWPM     0x1000
  86 #define TEA5764_TNCTRL_IFCTC    0x0800
  87 #define TEA5764_TNCTRL_AFM      0x0400
  88 #define TEA5764_TNCTRL_SMUTE    0x0200
  89 #define TEA5764_TNCTRL_SNC      0x0100
  90 #define TEA5764_TNCTRL_MU       0x0080
  91 #define TEA5764_TNCTRL_SSL1     0x0040
  92 #define TEA5764_TNCTRL_SSL0     0x0020
  93 #define TEA5764_TNCTRL_HLSI     0x0010
  94 #define TEA5764_TNCTRL_MST      0x0008
  95 #define TEA5764_TNCTRL_SWP      0x0004
  96 #define TEA5764_TNCTRL_DTC      0x0002
  97 #define TEA5764_TNCTRL_AHLSI    0x0001
  98
  99 #define TEA5764_TUNCHK_LEVEL(x) (((x) & 0x00F0) >> 4)
 100 #define TEA5764_TUNCHK_IFCNT(x) (((x) & 0xFE00) >> 9)
 101 #define TEA5764_TUNCHK_TUNTO    0x0100
 102 #define TEA5764_TUNCHK_LD       0x0008
 103 #define TEA5764_TUNCHK_STEREO   0x0004
 104
 105 #define TEA5764_TESTREG_TRIGFR  0x0800
 106
 107 struct tea5764_regs {
 108         u16 intreg;                             /* INTFLAG & INTMSK */
 109         u16 frqset;                             /* FRQSETMSB & FRQSETLSB */
 110         u16 tnctrl;                             /* TNCTRL1 & TNCTRL2 */
 111         u16 frqchk;                             /* FRQCHKMSB & FRQCHKLSB */
 112         u16 tunchk;                             /* IFCHK & LEVCHK */
 113         u16 testreg;                            /* TESTBITS & TESTMODE */
 114         u16 rdsstat;                            /* RDSSTAT1 & RDSSTAT2 */
 115         u16 rdslb;                              /* RDSLBMSB & RDSLBLSB */
 116         u16 rdspb;                              /* RDSPBMSB & RDSPBLSB */
 117         u16 rdsbc;                              /* RDSBBC & RDSGBC */
 118         u16 rdsctrl;                            /* RDSCTRL1 & RDSCTRL2 */
 119         u16 rdsbbl;                             /* PAUSEDET & RDSBBL */
 120         u16 manid;                              /* MANID1 & MANID2 */
 121         u16 chipid;                             /* CHIPID1 & CHIPID2 */
 122 } __attribute__ ((packed));
 123
 124 struct tea5764_write_regs {
 125         u8 intreg;                              /* INTMSK */
 126         u16 frqset;                             /* FRQSETMSB & FRQSETLSB */
 127         u16 tnctrl;                             /* TNCTRL1 & TNCTRL2 */
 128         u16 testreg;                            /* TESTBITS & TESTMODE */
 129         u16 rdsctrl;                            /* RDSCTRL1 & RDSCTRL2 */
 130         u16 rdsbbl;                             /* PAUSEDET & RDSBBL */
 131 } __attribute__ ((packed));
 132
 133 #ifndef RADIO_TEA5764_XTAL
 134 #define RADIO_TEA5764_XTAL 1
 135 #endif
 136
 137 static int radio_nr = -1;
 138 static int use_xtal = RADIO_TEA5764_XTAL;
 139
 140 struct tea5764_device {
 141         struct i2c_client               *i2c_client;
 142         struct video_device             *videodev;
 143         struct tea5764_regs             regs;
 144         struct mutex                    mutex;
 145         int                             users;
 146 };
 147
 148 /* I2C code related */
 149 int tea5764_i2c_read(struct tea5764_device *radio)
 150 {
 151         int i;
 152         u16 *p = (u16 *) &radio->regs;
 153
 154         struct i2c_msg msgs[1] = {
 155                 { radio->i2c_client->addr, I2C_M_RD, sizeof(radio->regs),
 156                         (void *)&radio->regs },
 157         };
 158         if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
 159                 return -EIO;
 160         for (i = 0; i < sizeof(struct tea5764_regs) / sizeof(u16); i++)
 161                 p[i] = __be16_to_cpu(p[i]);
 162
 163         return 0;
 164 }
 165
 166 int tea5764_i2c_write(struct tea5764_device *radio)
 167 {
 168         struct tea5764_write_regs wr;
 169         struct tea5764_regs *r = &radio->regs;
 170         struct i2c_msg msgs[1] = {
 171                 { radio->i2c_client->addr, 0, sizeof(wr), (void *) &wr },
 172         };
 173         wr.intreg  = r->intreg & 0xff;
 174         wr.frqset  = __cpu_to_be16(r->frqset);
 175         wr.tnctrl  = __cpu_to_be16(r->tnctrl);
 176         wr.testreg = __cpu_to_be16(r->testreg);
 177         wr.rdsctrl = __cpu_to_be16(r->rdsctrl);
 178         wr.rdsbbl  = __cpu_to_be16(r->rdsbbl);
 179         if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
 180                 return -EIO;
 181         return 0;
 182 }
 183
 184 /* V4L2 code related */
 185 static struct v4l2_queryctrl radio_qctrl[] = {
 186         {
 187                 .id            = V4L2_CID_AUDIO_MUTE,
 188                 .name          = "Mute",
 189                 .minimum       = 0,
 190                 .maximum       = 1,
 191                 .default_value = 1,
 192                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 193         }
 194 };
 195
 196 static void tea5764_power_up(struct tea5764_device *radio)
 197 {
 198         struct tea5764_regs *r = &radio->regs;
 199
 200         if (!(r->tnctrl & TEA5764_TNCTRL_PUPD0)) {
 201                 r->tnctrl &= ~(TEA5764_TNCTRL_AFM | TEA5764_TNCTRL_MU |
 202                                TEA5764_TNCTRL_HLSI);
 203                 if (!use_xtal)
 204                         r->testreg |= TEA5764_TESTREG_TRIGFR;
 205                 else
 206                         r->testreg &= ~TEA5764_TESTREG_TRIGFR;
 207
 208                 r->tnctrl |= TEA5764_TNCTRL_PUPD0;
 209                 tea5764_i2c_write(radio);
 210         }
 211 }
 212
 213 static void tea5764_power_down(struct tea5764_device *radio)
 214 {
 215         struct tea5764_regs *r = &radio->regs;
 216
 217         if (r->tnctrl & TEA5764_TNCTRL_PUPD0) {
 218                 r->tnctrl &= ~TEA5764_TNCTRL_PUPD0;
 219                 tea5764_i2c_write(radio);
 220         }
 221 }
 222
 223 static void tea5764_set_freq(struct tea5764_device *radio, int freq)
 224 {
 225         struct tea5764_regs *r = &radio->regs;
 226
 227         /* formula: (freq [+ or -] 225000) / 8192 */
 228         if (r->tnctrl & TEA5764_TNCTRL_HLSI)
 229                 r->frqset = (freq + 225000) / 8192;
 230         else
 231                 r->frqset = (freq - 225000) / 8192;
 232 }
 233
 234 static int tea5764_get_freq(struct tea5764_device *radio)
 235 {
 236         struct tea5764_regs *r = &radio->regs;
 237
 238         if (r->tnctrl & TEA5764_TNCTRL_HLSI)
 239                 return (r->frqchk * 8192) - 225000;
 240         else
 241                 return (r->frqchk * 8192) + 225000;
 242 }
 243
 244 /* tune an frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
 245 static void tea5764_tune(struct tea5764_device *radio, int freq)
 246 {
 247         tea5764_set_freq(radio, freq);
 248         if (tea5764_i2c_write(radio))
 249                 PWARN("Could not set frequency!");
 250 }
 251
 252 static void tea5764_set_audout_mode(struct tea5764_device *radio, int audmode)
 253 {
 254         struct tea5764_regs *r = &radio->regs;
 255         int tnctrl = r->tnctrl;
 256
 257         if (audmode == V4L2_TUNER_MODE_MONO)
 258                 r->tnctrl |= TEA5764_TNCTRL_MST;
 259         else
 260                 r->tnctrl &= ~TEA5764_TNCTRL_MST;
 261         if (tnctrl != r->tnctrl)
 262                 tea5764_i2c_write(radio);
 263 }
 264
 265 static int tea5764_get_audout_mode(struct tea5764_device *radio)
 266 {
 267         struct tea5764_regs *r = &radio->regs;
 268
 269         if (r->tnctrl & TEA5764_TNCTRL_MST)
 270                 return V4L2_TUNER_MODE_MONO;
 271         else
 272                 return V4L2_TUNER_MODE_STEREO;
 273 }
 274
 275 static void tea5764_mute(struct tea5764_device *radio, int on)
 276 {
 277         struct tea5764_regs *r = &radio->regs;
 278         int tnctrl = r->tnctrl;
 279
 280         if (on)
 281                 r->tnctrl |= TEA5764_TNCTRL_MU;
 282         else
 283                 r->tnctrl &= ~TEA5764_TNCTRL_MU;
 284         if (tnctrl != r->tnctrl)
 285                 tea5764_i2c_write(radio);
 286 }
 287
 288 static int tea5764_is_muted(struct tea5764_device *radio)
 289 {
 290         return radio->regs.tnctrl & TEA5764_TNCTRL_MU;
 291 }
 292
 293 /* V4L2 vidioc */
 294 static int vidioc_querycap(struct file *file, void  *priv,
 295                                         struct v4l2_capability *v)
 296 {
 297         struct tea5764_device *radio = video_drvdata(file);
 298         struct video_device *dev = radio->videodev;
 299
 300         strlcpy(v->driver, dev->dev.driver->name, sizeof(v->driver));
 301         strlcpy(v->card, dev->name, sizeof(v->card));
 302         snprintf(v->bus_info, sizeof(v->bus_info),
 303                  "I2C:%s", dev_name(&dev->dev));
 304         v->version = RADIO_VERSION;
 305         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 306         return 0;
 307 }
 308
 309 static int vidioc_g_tuner(struct file *file, void *priv,
 310                                 struct v4l2_tuner *v)
 311 {
 312         struct tea5764_device *radio = video_drvdata(file);
 313         struct tea5764_regs *r = &radio->regs;
 314
 315         if (v->index > 0)
 316                 return -EINVAL;
 317
 318         memset(v, 0, sizeof(*v));
 319         strcpy(v->name, "FM");
 320         v->type = V4L2_TUNER_RADIO;
 321         tea5764_i2c_read(radio);
 322         v->rangelow   = FREQ_MIN * FREQ_MUL;
 323         v->rangehigh  = FREQ_MAX * FREQ_MUL;
 324         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
 325         if (r->tunchk & TEA5764_TUNCHK_STEREO)
 326                 v->rxsubchans = V4L2_TUNER_SUB_STEREO;
 327         else
 328                 v->rxsubchans = V4L2_TUNER_SUB_MONO;
 329         v->audmode = tea5764_get_audout_mode(radio);
 330         v->signal = TEA5764_TUNCHK_LEVEL(r->tunchk) * 0xffff / 0xf;
 331         v->afc = TEA5764_TUNCHK_IFCNT(r->tunchk);
 332
 333         return 0;
 334 }
 335
 336 static int vidioc_s_tuner(struct file *file, void *priv,
 337                                 struct v4l2_tuner *v)
 338 {
 339         struct tea5764_device *radio = video_drvdata(file);
 340
 341         if (v->index > 0)
 342                 return -EINVAL;
 343
 344         tea5764_set_audout_mode(radio, v->audmode);
 345         return 0;
 346 }
 347
 348 static int vidioc_s_frequency(struct file *file, void *priv,
 349                                 struct v4l2_frequency *f)
 350 {
 351         struct tea5764_device *radio = video_drvdata(file);
 352
 353         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 354                 return -EINVAL;
 355         if (f->frequency == 0) {
 356                 /* We special case this as a power down control. */
 357                 tea5764_power_down(radio);
 358         }
 359         if (f->frequency < (FREQ_MIN * FREQ_MUL))
 360                 return -EINVAL;
 361         if (f->frequency > (FREQ_MAX * FREQ_MUL))
 362                 return -EINVAL;
 363         tea5764_power_up(radio);
 364         tea5764_tune(radio, (f->frequency * 125) / 2);
 365         return 0;
 366 }
 367
 368 static int vidioc_g_frequency(struct file *file, void *priv,
 369                                 struct v4l2_frequency *f)
 370 {
 371         struct tea5764_device *radio = video_drvdata(file);
 372         struct tea5764_regs *r = &radio->regs;
 373
 374         if (f->tuner != 0)
 375                 return -EINVAL;
 376         tea5764_i2c_read(radio);
 377         memset(f, 0, sizeof(*f));
 378         f->type = V4L2_TUNER_RADIO;
 379         if (r->tnctrl & TEA5764_TNCTRL_PUPD0)
 380                 f->frequency = (tea5764_get_freq(radio) * 2) / 125;
 381         else
 382                 f->frequency = 0;
 383
 384         return 0;
 385 }
 386
 387 static int vidioc_queryctrl(struct file *file, void *priv,
 388                             struct v4l2_queryctrl *qc)
 389 {
 390         int i;
 391
 392         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 393                 if (qc->id && qc->id == radio_qctrl[i].id) {
 394                         memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
 395                         return 0;
 396                 }
 397         }
 398         return -EINVAL;
 399 }
 400
 401 static int vidioc_g_ctrl(struct file *file, void *priv,
 402                             struct v4l2_control *ctrl)
 403 {
 404         struct tea5764_device *radio = video_drvdata(file);
 405
 406         switch (ctrl->id) {
 407         case V4L2_CID_AUDIO_MUTE:
 408                 tea5764_i2c_read(radio);
 409                 ctrl->value = tea5764_is_muted(radio) ? 1 : 0;
 410                 return 0;
 411         }
 412         return -EINVAL;
 413 }
 414
 415 static int vidioc_s_ctrl(struct file *file, void *priv,
 416                             struct v4l2_control *ctrl)
 417 {
 418         struct tea5764_device *radio = video_drvdata(file);
 419
 420         switch (ctrl->id) {
 421         case V4L2_CID_AUDIO_MUTE:
 422                 tea5764_mute(radio, ctrl->value);
 423                 return 0;
 424         }
 425         return -EINVAL;
 426 }
 427
 428 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 429 {
 430         *i = 0;
 431         return 0;
 432 }
 433
 434 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 435 {
 436         if (i != 0)
 437                 return -EINVAL;
 438         return 0;
 439 }
 440
 441 static int vidioc_g_audio(struct file *file, void *priv,
 442                            struct v4l2_audio *a)
 443 {
 444         if (a->index > 1)
 445                 return -EINVAL;
 446
 447         strcpy(a->name, "Radio");
 448         a->capability = V4L2_AUDCAP_STEREO;
 449         return 0;
 450 }
 451
 452 static int vidioc_s_audio(struct file *file, void *priv,
 453                            struct v4l2_audio *a)
 454 {
 455         if (a->index != 0)
 456                 return -EINVAL;
 457
 458         return 0;
 459 }
 460
 461 static int tea5764_open(struct file *file)
 462 {
 463         /* Currently we support only one device */
 464         struct tea5764_device *radio = video_drvdata(file);
 465
 466         mutex_lock(&radio->mutex);
 467         /* Only exclusive access */
 468         if (radio->users) {
 469                 mutex_unlock(&radio->mutex);
 470                 return -EBUSY;
 471         }
 472         radio->users++;
 473         mutex_unlock(&radio->mutex);
 474         file->private_data = radio;
 475         return 0;
 476 }
 477
 478 static int tea5764_close(struct file *file)
 479 {
 480         struct tea5764_device *radio = video_drvdata(file);
 481
 482         if (!radio)
 483                 return -ENODEV;
 484         mutex_lock(&radio->mutex);
 485         radio->users--;
 486         mutex_unlock(&radio->mutex);
 487         return 0;
 488 }
 489
 490 /* File system interface */
 491 static const struct v4l2_file_operations tea5764_fops = {
 492         .owner          = THIS_MODULE,
 493         .open           = tea5764_open,
 494         .release        = tea5764_close,
 495         .ioctl          = video_ioctl2,
 496 };
 497
 498 static const struct v4l2_ioctl_ops tea5764_ioctl_ops = {
 499         .vidioc_querycap    = vidioc_querycap,
 500         .vidioc_g_tuner     = vidioc_g_tuner,
 501         .vidioc_s_tuner     = vidioc_s_tuner,
 502         .vidioc_g_audio     = vidioc_g_audio,
 503         .vidioc_s_audio     = vidioc_s_audio,
 504         .vidioc_g_input     = vidioc_g_input,
 505         .vidioc_s_input     = vidioc_s_input,
 506         .vidioc_g_frequency = vidioc_g_frequency,
 507         .vidioc_s_frequency = vidioc_s_frequency,
 508         .vidioc_queryctrl   = vidioc_queryctrl,
 509         .vidioc_g_ctrl      = vidioc_g_ctrl,
 510         .vidioc_s_ctrl      = vidioc_s_ctrl,
 511 };
 512
 513 /* V4L2 interface */
 514 static struct video_device tea5764_radio_template = {
 515         .name           = "TEA5764 FM-Radio",
 516         .fops           = &tea5764_fops,
 517         .ioctl_ops      = &tea5764_ioctl_ops,
 518         .release        = video_device_release,
 519 };
 520
 521 /* I2C probe: check if the device exists and register with v4l if it is */
 522 static int __devinit tea5764_i2c_probe(struct i2c_client *client,
 523                                         const struct i2c_device_id *id)
 524 {
 525         struct tea5764_device *radio;
 526         struct tea5764_regs *r;
 527         int ret;
 528
 529         PDEBUG("probe");
 530         radio = kmalloc(sizeof(struct tea5764_device), GFP_KERNEL);
 531         if (!radio)
 532                 return -ENOMEM;
 533
 534         mutex_init(&radio->mutex);
 535         radio->i2c_client = client;
 536         ret = tea5764_i2c_read(radio);
 537         if (ret)
 538                 goto errfr;
 539         r = &radio->regs;
 540         PDEBUG("chipid = %04X, manid = %04X", r->chipid, r->manid);
 541         if (r->chipid != TEA5764_CHIPID ||
 542                 (r->manid & 0x0fff) != TEA5764_MANID) {
 543                 PWARN("This chip is not a TEA5764!");
 544                 ret = -EINVAL;
 545                 goto errfr;
 546         }
 547
 548         radio->videodev = video_device_alloc();
 549         if (!(radio->videodev)) {
 550                 ret = -ENOMEM;
 551                 goto errfr;
 552         }
 553         memcpy(radio->videodev, &tea5764_radio_template,
 554                 sizeof(tea5764_radio_template));
 555
 556         i2c_set_clientdata(client, radio);
 557         video_set_drvdata(radio->videodev, radio);
 558
 559         ret = video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr);
 560         if (ret < 0) {
 561                 PWARN("Could not register video device!");
 562                 goto errrel;
 563         }
 564
 565         /* initialize and power off the chip */
 566         tea5764_i2c_read(radio);
 567         tea5764_set_audout_mode(radio, V4L2_TUNER_MODE_STEREO);
 568         tea5764_mute(radio, 1);
 569         tea5764_power_down(radio);
 570
 571         PINFO("registered.");
 572         return 0;
 573 errrel:
 574         video_device_release(radio->videodev);
 575 errfr:
 576         kfree(radio);
 577         return ret;
 578 }
 579
 580 static int __devexit tea5764_i2c_remove(struct i2c_client *client)
 581 {
 582         struct tea5764_device *radio = i2c_get_clientdata(client);
 583
 584         PDEBUG("remove");
 585         if (radio) {
 586                 tea5764_power_down(radio);
 587                 video_unregister_device(radio->videodev);
 588                 kfree(radio);
 589         }
 590         return 0;
 591 }
 592
 593 /* I2C subsystem interface */
 594 static const struct i2c_device_id tea5764_id[] = {
 595         { "radio-tea5764", 0 },
 596         { }                                     /* Terminating entry */
 597 };
 598 MODULE_DEVICE_TABLE(i2c, tea5764_id);
 599
 600 static struct i2c_driver tea5764_i2c_driver = {
 601         .driver = {
 602                 .name = "radio-tea5764",
 603                 .owner = THIS_MODULE,
 604         },
 605         .probe = tea5764_i2c_probe,
 606         .remove = __devexit_p(tea5764_i2c_remove),
 607         .id_table = tea5764_id,
 608 };
 609
 610 /* init the driver */
 611 static int __init tea5764_init(void)
 612 {
 613         int ret = i2c_add_driver(&tea5764_i2c_driver);
 614
 615         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ": "
 616                 DRIVER_DESC "\n");
 617         return ret;
 618 }
 619
 620 /* cleanup the driver */
 621 static void __exit tea5764_exit(void)
 622 {
 623         i2c_del_driver(&tea5764_i2c_driver);
 624 }
 625
 626 MODULE_AUTHOR(DRIVER_AUTHOR);
 627 MODULE_DESCRIPTION(DRIVER_DESC);
 628 MODULE_LICENSE("GPL");
 629
 630 module_param(use_xtal, int, 1);
 631 MODULE_PARM_DESC(use_xtal, "Chip have a xtal connected in board");
 632 module_param(radio_nr, int, 0);
 633 MODULE_PARM_DESC(radio_nr, "video4linux device number to use");
 634
 635 module_init(tea5764_init);
 636 module_exit(tea5764_exit);